Gustav Ludwig Hertz | |
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Born | |
Died | 30 October 1975 88) East Berlin, East Germany | (aged
Alma mater | Humboldt University of Berlin |
Known for | Franck–Hertz experiment |
Spouse | Ellen Dihlmann (m. 1919;died 1941) |
Children | 2, including Carl Hellmuth |
Relatives |
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Awards |
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Scientific career | |
Fields | Physics |
Institutions | |
Doctoral advisor | |
Doctoral students | Heinz Pose |
Gustav Ludwig Hertz ( /hɜːrts/ ; German: [ˈɡʊs.tafˈluːt.vɪçhɛʁt͡s] ; 22 July 1887 – 30 October 1975) [1] was a German experimental physicist and Nobel Prize winner for his work on inelastic electron collisions in gases, and a nephew of Heinrich Hertz.
Hertz was born in Hamburg, the son of Auguste (née Arning) and a lawyer, Gustav Theodor Hertz (1858–1904), [1] Heinrich Rudolf Hertz's brother. He attended the Gelehrtenschule des Johanneums before studying at the Georg-August University of Göttingen (1906–1907), the Ludwig Maximilian University of Munich (1907–1908), and the Humboldt University of Berlin (1908–1911). He received his doctorate in 1911 under Heinrich Leopold Rubens. [2] [3]
From 1911 to 1914, Hertz was an assistant to Rubens at the University of Berlin. It was during this time that Hertz and James Franck performed experiments on inelastic electron collisions in gases, [4] known as the Franck–Hertz experiments, and for which they received the Nobel Prize in Physics in 1925. [5]
During World War I, Hertz served in the military from 1914. In 1915 he joined Fritz Haber's unit that would introduce poisonous chlorine gas as a weapon. [6] He was seriously wounded in 1915. In 1917, he returned to the University of Berlin as a Privatdozent. In 1920, he took a job as a research physicist at the Philips Incandescent Lamp Factory in Eindhoven, which he held until 1925. [1]
In 1925, Hertz became ordinarius professor and director of the Physics Institute of the Martin Luther University of Halle-Wittenberg. In 1928 he became ordinarius professor of experimental physics and director of the Physics Institute of the Technische Hochschule Berlin ("THB"), now Technische Universität Berlin. While there, he developed an isotope separation technique via gaseous diffusion. Since Hertz was an officer during World War I, he was temporarily protected from National Socialist policies and the Law for the Restoration of the Professional Civil Service, but eventually the policies and laws became more stringent, and at the end of 1934, he was forced to resign his position at THB, as he was classified as a "second degree part-Jew" (his paternal grandfather Gustav Ferdinand Hertz (originally named David Gustav Hertz) (1827–1914) had been Jewish as a child, before his whole family had converted to Lutheranism in 1834). [7] He then took a position at Siemens, as director of Research Laboratory II. While there, he continued his work on atomic physics and ultrasound, but he eventually discontinued his work on isotope separation. He held this position until he departed for the Soviet Union in 1945. [3] [1] [8]
Hertz was concerned for his safety and, like his fellow Nobel laureate James Franck, was looking to move to the USA or any other place outside Germany. So he made a pact with three colleagues: Manfred von Ardenne, director of his private laboratory Forschungslaboratorium für Elektronenphysik, Peter Adolf Thiessen, ordinarius professor at the Humboldt University of Berlin and director of the Kaiser-Wilhelm Institut für physikalische Chemie und Elektrochemie (KWIPC) in Berlin-Dahlem, and Max Volmer, ordinarius professor and director of the Physical Chemistry Institute at the THB. [9] The pact was a pledge that whoever first made contact with the Soviets would speak for the rest. The objectives of their pact were threefold: (1) prevent plunder of their institutes, (2) continue their work with minimal interruption, and (3) protect themselves from prosecution for any political acts of the past. [10] Before the end of World War II, Thiessen, a member of the Nazi Party, had Communist contacts. [11]
On 27 April 1945, Thiessen arrived at von Ardenne's institute in an armored vehicle with a major of the Soviet Army, who was also a leading Soviet chemist. [12] All four of the pact members were taken to the Soviet Union. Hertz was made head of Institute G, in Agudseri (Agudzery), about 10 km southeast of Sukhumi and a suburb of Gul'rips (Gulrip'shi). [12] [13] Topics assigned to Gustav Hertz's Institute G included: (1) Separation of isotopes by diffusion in a flow of inert gases, for which Gustav Hertz was the leader, (2) Development of a condensation pump, for which Justus Mühlenpfordt was the leader, (3) Design and build a mass spectrometer for determining the isotopic composition of uranium, for which Werner Schütze was the leader, (4) Development of frameless (ceramic) diffusion partitions for filters, for which Reinhold Reichmann was the leader, and (5) Development of a theory of stability and control of a diffusion cascade, for which Heinz Barwich was the leader; [12] [14]
Barwich had been deputy to Hertz at Siemens. [15] Other members of Institute G were Werner Hartmann and Karl-Franz Zühlke. [16] Manfred von Ardenne was made head of Institute A. Goals of von Ardenne's Institute A included: (1) Electromagnetic separation of isotopes, for which von Ardenne was the leader, (2) Techniques for manufacturing porous barriers for isotope separation, for which Peter Adolf Thiessen was the leader, and (3) Molecular techniques for separation of uranium isotopes, for which Max Steenbeck was the leader.
In his first meeting with Lavrentij Beria, von Ardenne was asked to participate in building the bomb, but von Ardenne quickly realized that participation would prohibit his repatriation to Germany, so he suggested isotope enrichment as an objective, which was agreed to.
By the end of the 1940s, nearly 300 Germans were working at the institute, and they were not the total work force. Institute A was used as the basis for the Sukhumi Physical-Technical Institute in Sinop, a suburb of Sukhumi. [12] [13] Volmer went to the Scientific Research Institute No. 9 (NII-9) [17] in Moscow; he was given a design bureau to work on the production of heavy water. In Institute A, Thiessen became leader for developing techniques for manufacturing porous barriers for isotope separation. [12]
In 1949, six German scientists, including Hertz, Thiessen, and Barwich were called in for consultation at Sverdlovsk-44, which was responsible for uranium enrichment. The plant, smaller than the American Oak Ridge gaseous diffusion plant, was getting only a little over half of the expected 90% or higher enrichment. [18]
After 1950, Hertz moved to Moscow. In 1951, Hertz was awarded a Stalin Prize, second class, with Barwich. [12] In that year, James Franck and Hertz were jointly awarded the Max Planck Medal by the Deutsche Physikalische Gesellschaft. Hertz remained in the Soviet Union until 1955. [3]
Upon return from the Soviet Union, Hertz became ordinarius professor at the University of Leipzig. From 1955 to 1967, he was also the chairman of the Physical Society of the Deutsche Demokratische Republik (GDR); he was honorary chairman from 1967 to 1975. [5]
Gustav Hertz was a nephew of Heinrich Rudolf Hertz and a cousin of Mathilde Carmen Hertz. In 1919, Hertz married Ellen née Dihlmann, who died in 1941. They had two sons, Carl Helmut Hertz and Johannes Heinrich Hertz; both became physicists. [1]
He died on 30 October 1975 in East Berlin at the age 88.
Hertz was a Member of the German Academy of Sciences in Berlin, Corresponding Member of the Göttingen Academy of Sciences, an Honorary Member of the Hungarian Academy of Sciences, a Member of the Czechoslovakian Academy of Sciences, and a Foreign Member of the USSR Academy of Sciences. [1]
Friedrich Georg "Fritz" Houtermans was a Dutch-Austrian-German atomic and nuclear physicist and Communist born in Zoppot near Danzig, West Prussia to a Dutch father, who was a wealthy banker. He was brought up in Vienna, where he was educated, and moved to Göttingen when he was 18 to study. It was in Göttingen where he obtained his Ph.D. under James Franck.
Manfred baron von Ardenne was a German researcher and applied physicist and inventor. He took out approximately 600 patents in fields including electron microscopy, medical technology, nuclear technology, plasma physics, and radio and television technology. From 1928 to 1945, he directed his private research laboratory Forschungslaboratorium für Elektronenphysik. For ten years after the World War II, Ardenne was one of many of the German nuclear physicists in the former Soviet program of nuclear weapons, and was honored with the Stalin Prize by the former Soviet Union.
Nazi Germany undertook several research programs relating to nuclear technology, including nuclear weapons and nuclear reactors, before and during World War II. These were variously called Uranverein or Uranprojekt. The first effort started in April 1939, just months after the discovery of nuclear fission in Berlin in December 1938, but ended only a few months later, shortly ahead of the September 1939 German invasion of Poland, for which many notable German physicists were drafted into the Wehrmacht. A second effort under the administrative purview of the Wehrmacht's Heereswaffenamt began on September 1, 1939, the day of the invasion of Poland. The program eventually expanded into three main efforts: Uranmaschine development, uranium and heavy water production, and uranium isotope separation. Eventually, the German military determined that nuclear fission would not contribute significantly to the war, and in January 1942 the Heereswaffenamt turned the program over to the Reich Research Council while continuing to fund the activity.
Wilhelm Walcher was a German experimental physicist. During World War II, he worked on the German nuclear energy project, also known as the Uranium Club; he worked on mass spectrometers for isotope separation. After the war, he was director of the Institute of Physics at the University of Marburg. He was a president of the German Physical Society and a vice president of the German Research Foundation. He helped found the Society for Heavy Ion Research and the German Electron Synchrotron DESY. He was also one of the 18 signatories of the Göttingen Manifest.
Peter Adolf Thiessen was a German physical chemist and a tribologist– he is credited as the founder of the tribochemistry.
Nikolaus Vasilyevich Riehl was a German nuclear chemist of Russian-Jewish descent. Before the fall of Berlin, he was director of the scientific headquarters of the Auergesellschaft AG, and was taken to the Soviet Union.
Max Christian Theodor Steenbeck was a German nuclear physicist who worked at the Siemens-Schuckertwerke in his early career, during which time he invented the betatron in 1934.
Max Volmer was a German physical chemist, who made important contributions in electrochemistry, in particular on electrode kinetics. He co-developed the Butler–Volmer equation. Volmer held the chair and directorship of the Physical Chemistry and Electrochemistry Institute of the Technische Hochschule Berlin, in Berlin-Charlottenburg. After World War II, he went to the Soviet Union, where he headed a design bureau for the production of heavy water. Upon his return to East Germany ten years later, he became a professor at the Humboldt University of Berlin and was president of the East German Academy of Sciences.
Heinz Barwich was a German nuclear physicist. He was deputy director of the Siemens Research Laboratory II in Berlin. At the close of World War II, he followed the decision of Gustav Hertz, to go to the Soviet Union for ten years to work on the Soviet atomic bomb project, for which he received the Stalin Prize. He was director of the Zentralinstitut für Kernforschung at Rossendorf near Dresden. For a few years he was director of the Joint Institute for Nuclear Research in Dubna, Soviet Union. In 1964 he defected to the West.
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